Voice coil suspension



'Sept. 6, 1938.

I. B. SERGE 2,129,628

VOICE COIL SUSPENSION Filed Dec. 20, 1955 Y 7 rv ATTORNEY.

Patented Sept. 6, 1938 UNITED STATES PATENT OFFICE Claims.

My invention relates to permanent dynamic sound reproducers and more particularly to a voice coil suspension of the type permitting axial movement of the voice coil structure in the air 5 gap but which restrains the same from lateral movement therewith.

An object of the present invention is to provide a novel voice coil suspension of simplified construction but which is very flexible and so designed as to facilitate the axial movement of the voice coil under power impulses of low" magnitude.

A further object of the present invention is to particularly improve the sound response of a sound reproducer by providing a semi-elliptical spider of relatively thin flexible material for yieldingly supporting said voice coil.

For a more detailed understanding of my invention, reference may be had to the accompanying drawing which illustrates one form which my invention may assume, and in which:

Fig. 1 is a side elevational view of a sound reproducer with parts being broken away and shown in section,

Fig. 2 is a plan sectional view showing the improved voice coil suspension and taken substantially on the line 2-2 of Fig. 1, and

Fig. 3 is a detail plan view of the flexible semielliptical spider voice coil suspension.

In the accompanying drawing I have illustrated my invention in connection with a conventional sound reproducer of the permanent dynamic type, although it will be perfectly obvious that the present voice coil suspension is adapted to other types of sound reproducers as Well. The present sound reproducer includes cone bracket ID for supporting the cone II which is in turn secured to a voice coil structure I2. A pole plate I3 supports the cone bracket and is provided with an opening I 4 for providing an air gap in cooperation with the pole piece I5 in which the voice coil structure is operated and preferably yieldingly supported for axial movement therein. A permanent magnet I6 is incorporated in the circuit for providing a magnetic field across the air gap between the pole plate and pole'piece.

The present invention relates more particularly to the means for suspending the voice coil structure and it will be noted that I have preferably provided 'a double voice coil suspension, the

front suspension comprising a. flexible diaphragm I l suitably carried by a bracket I8 fastened to the pole plate I3. This voice coil is supported at the rear by means of a semi-elliptical flexible spider I9 which is preferably carried by means of a stud or other anchoring device 20. The spider is preferably cemented or otherwise fastened to the voice coil structure in the usual manner, and preferably adjacent the rear thereof. This semi-elliptical flexible spider l9 includes an anchor portion 2| provided with an opening 5 or hole 22 for attachment to the single stud 20. Extending from the anchor portion 2| are two diverging arms 23 which are very flexible and are each connected as at 24 to a voice coil supporting ring 25, this ring being glued or other- 10 wise cemented along its inside edge to the voice coil structure. It may be further noted that these diverging arms 23 are preferably tapered to facilitate the flexing of the arms for providing a readily yieldable voice coil suspension. 15

A semi-elliptical spider voice coil suspension, such as herein illustrated and described, provides a very flexible support for the voice coil, and because of the single anchor portion provided, it will be noted that it is possible to there- 20 by design and construct a very compact sound reproducer, which is preferably adapted for assembly in auto receiving sets. Furthermore, the construction of a spider of this type facilitates the assembly thereof with the pole plate 25 and other related parts of the sound reproducer, thereby facilitating more economical manufacture at a saving in both time and material.

Although I have illustrated but one form of my invention and have described in detail but a 30 single application thereof, it will be apparent to those skilled in the art to which my invention pertains that various modifications and changes may be made therein without departing from the spirit of my invention or from the scope 35 of the appended claims.

What I claim as my invention is:

1. A single vibratory voice coil suspension for a sound reproducer and providing a unitary support serving as the sole supporting means for 40 one end of the voice coil structure, said suspension comprising a semi-elliptical spider anchored at one end only and including a voice coil supporting portion and flexible arm portions, said arm portions being so constructed and arranged 5 as to vibrate without being substantially stretched.

2. A single vibratory voice coil suspension for a sound reproducerand providing a unitary support serving as the sole supporting means for one 50 end of the voice coil structure, said suspension comprising a semi-elliptical spiderincluding a single anchor portion, a voice coil supporting portion and flexible arm portions connected with said single anchor portion and with spaced points 55 of said supporting portion, said arm portions being so constructed and arranged as to vibrate Without being substantially stretched.

3. A single vibratory voice coil suspension for a sound reproducer and providing a unitary support serving as the sole supporting means for one end of the voice coil structure, said suspension comprising a semi-elliptical spider including a single anchor portion, a voice coil supporting portion and flexible arm portions connected with said single anchor portion and with spaced points of said supporting portion, said arm portions each comprising substantially fiat flexible arms of progressively decreasing width from said anchor portion to the voice coil supporting portion, said arm portions being so constructed and arranged as tovibrate without being substantially stretched.

i. A single vibratory voice coil suspension for a sound reproducer and providing a unitary support serving as the sole supporting means for one end of the voice coil structure, said suspension comprising a semi-elliptical spider including a single anchor portion, a pair of diverging flexible arms, and a voice coil supporting ring, said arms each connected with said supporting ring at substantially diametrical opposite points, said arms being so constructed and arranged as to vibrate without being substantially stretched.

5. In a sound reproducer including a pole plate and pole stem cooperating toprovide an air gap, a motor unit including a vibrating voice coil structure, means for supporting said voice coil structure including a single vibratory voice coil suspension providing a unitary support serving as the sole supporting means for one end of said voice coil structure, said suspension comprising a semi-elliptical spider including a single anchor portion secured to said pole plate, a voice coil supporting ring secured tosaid voice coil and a pair of diverging flexible tapered arms connected with said anchor portion and with said voice coil supporting ring, said arms being so constructed and arranged as to vibrate without being substantially stretched.

IGOR B. SERGE. 

